求此题的完整的程序设计，一定要完整！能在VC++6.0上运行。

Question

Answer 1

先mark下，完整的代码稍后给你写

#include<iostream>
using namespace std;
class Date
{
public:
    Date(int year = 1900, int month = 1, int day = 1)   //构造
    :_year(year)
    , _month(month)
    , _day(day)
    {
        if (!isInvalidDate(_year, _month, _day))
        {
            _year = 1900;
            _month = 1;
            _day = 1;
        }
    }

    Date operator+(int count)
    { 
        Date tmp(*this);
        tmp._day += count;
        ToCorrect(tmp);
        return tmp;
    }
    Date operator-(int count)
    {
        Date tmp(*this);
        tmp._day -= count;
        ToCorrect(tmp);
        return tmp;
    }

    Date& operator++()   //前置++
    {
        (*this)++;
        return *this;
    }
    Date operator++(int)    //后置++
    {
        Date tmp(*this);
        (*this)+=1;
        return tmp;
    }
    Date& operator--()
    {
        (*this)--;
        return *this;
    }
    Date operator--(int)
    {
        Date tmp(*this);
        (*this)--;
        return tmp;
    }
    int operator-(const Date &d)
    {
        int flag = 1;
        Date max = *this;
        Date min = d;
        if (*this<d)
        {
            max = d;
            min = *this;
            flag = -1;
        }
        int count=0;
        while (min != max)
        {
            ++min;
            count++;
        }
        return count*flag;
    }
    Date& operator+=(int day)
    {
        *this = *this + day;
        return *this;
    }
    bool operator!=(const Date &d)
    {
        return !(*this == d);
    }
    bool operator<(const Date &d)
    {
        return !((*this>d)||(*this==d));
    }
    bool operator>=(const Date &d)
    {
        return !(*this<d);
    }
    bool operator>(const Date &d)
    {
        return (_year > d._year
            || (_year == d._year && _month > d._month)
            || (_year == d._year && _month == d._month && _day > d._day));
    }
    bool operator==(const Date &d)
    {
        return ((_year == d._year) && (_month == d._month) && (_day == d._day));
    }

public:    
    bool IsLeapYear(int year)
    {
        if(year % 400 || (year % 4 && year % 100))
            return true;
        return false;
    }
    int YearsOfMonth(int year, int month)
    {
        int day;
        int days[13] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
        day = days[month];
        if (month == 2)
            day += IsLeapYear(year);
        return day;
    }

    Date ToCorrect(Date &d)
    {
        if (d._day>YearsOfMonth(d._year, d._month))
        {
            while (d._day > YearsOfMonth(d._year, d._month))
            {
                 d._day -= YearsOfMonth(d._year,d._month);

                if (d._month == 12)
                {
                    d._year++;
                    d._month = 1;
                }
                else
                {
                    ++d._month;
                }
            }
        }
        else
        {
            while (d._day <= 0)
            {
                if (d._month == 1)
                {
                    d._year--;
                    d._month = 12;
                }
                else
                {
                    --d._month;
                }
                d._day += YearsOfMonth(d._year, d._month);
            }
        }
        return d;
    }


    bool isInvalidDate(int year, int month, int day)
    {
        if ((year < 1) || (month<0 || month>12) || (day<0 || day>YearsOfMonth(year,month)))
            return false;
        return true;
    }
    void Display()
    {
        cout << _year << "-" << _month << "-" << _day << endl;
    }
    friend istream& operator>>(istream& is, Date &d);
    friend ostream& operator<<(ostream& os, const Date &d);
private:
    int _year;
    int _month;
    int _day;
};
istream& operator>>(istream& is, Date& d)
{
    cout << "请输入一个日期" << endl;
    is >> d._year >> d._month >> d._day;
    return is;
}

ostream& operator<<(ostream& os, const Date &d)
{
    cout << d._year << "-" <<d. _month << "-" << d._day << endl;
    return os;
}
int main()
{
    /*Date d1(2016,8,18);
    //d1.Display();

    //d1 = d1++;
    cout << d1 << endl;*/

    //Date d1(2015, 12, 3);
    //(d1++).Display();  //d1.operator++(&d1, 0);
    //(++d1).Display(); //d1.operator++(&d1);

    Date d1(2015, 12, 3);
    Date d2(2015, 11, 1);
    cout << (d1 - d2) << endl;

    //Date d1(2015, 12, 3);
    //Date ret = d1 + 40; //operator+
    //ret.Display();


    /*Date d1(2015, 12, 3);
    Date ret = d1 + 40;
    d1 = ret;
    ret = d1 - 40;
    ret.Display();*/

    /*Date ret;
    Date d2(2015, 1, 1);
    ret = d2 - 1;
    ret.Display();*/
    return 0;
}